Improvement in quartz-mills



A. MOORE.

Quartz Mill.

Patented July 17, 1866..

wwM/V/VMVV /A UNITED STATES PATENT OFFICE.

ALBERT MOORE, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN QUARTZ-MILLS.

Specification forming part of Letters Patent N 0. 56,433, dated July 17, 1866.

To all whom it may concern.-

Be it known that I, ALBERT MOORE, of the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Shoes and Dies for Reducing Ores Containing Precious Metals; and I do hereby declare the following description and accompanying drawings are sufficient to enable any person skilled in the art or science to which it most nearly appertains to make and use my said invention or improve ments without further invention or experiment.

The nature of my invention consists in the employment of shoes and dies for reducing ores containing the precious metals, Whose grinding-surface shall present no continuous straight lines from center to periphery, by

which the pulp shall find its way to the pe-' riphery of the mullers, and not be acted upon by their grinding influence.

In the drawings, Figure 1 represents a shoe or die of my invention; Fig. 2, a side section of the same.

A represents a shoe or die which forms a segment of a grinder or muller of my invention. B B B are grooves placed in the upper and nether plate, whose grinding-surfaces correspond with each-other, each plate having three grooves, radiating from the hub or feedcenter (where they are deepest out) toward the circumference of the m ullers for about onehalf of the breadth of the plate, where they taper to a point, the two outer grooves, or B B, extending farther than the middle groove, or B.

My shoes and dies are so arranged, when formed together for operation, that each plate shall fit in opposite joints. The edges of each plate are beveled and set apart about one inch (more or less) on the bed-plate or mullerhead, to admit spaces for quicksilver, each section being fastened to the muller-head and grinder by any well-known device. By this arrangement of shoes and dies for grindingsurfaces for ores, it is intended that no continuous straight lines shall appear from the axis of the grindingsurfaces to their circumference; but all the lines are broken by joints, so that no ore or pulp will pass from between the mullers without first meeting with resistance by coming in contact with the broken lines or joints.

The ore is fed in the center (after the manner of a grist-mill) with water, quicksilver being placed in the center of the lower grindingsurface, as well as in the spaces between the plates, and if used in my improved grinder and amalgam ator it may be placed around the shoes and dies as there described.

Some of the advantages of my improved shoes and dies over those ordinarily constructed may be enumerated as follows:

First. By removing the feed from the center of the mullers the plates wear equally and grind faster, while the quicksilver is not acted upon by the mullers, it being placed in the spaces between the plates and 011 its bedplate in the center and around its mullers below the grinding-surface.

Second. By the arrangement of the tapering grooves the ore or pulp is thrown outward toward the periphery of the mullers by centrifugal force, Where it comes in contact with the broken lines or joints, and is evenly distributed over the grinding-surfaces of the shoes and dies, and is not thrown off so rapidly as where straight lines are employed in mullers for grinding and amalgamating ores.

Having thus described my improved shoes and dies, what I claim, and desire to secure by Letters Patent, is

1. In combination with the radial feedingfurrows B B B, the plain surface beyond the ends of the furrows, substantially as described, for the purposes set forth.

2. The manner of breaking the joints in constructing and laying the shoes and dies, so that no continuous straight lines shall be employed from the feed-center of the muller to its circumference, substantially as described, and for the purpose set forth.

In witness whereof I have hereunto set my hand and seal this 26th day of January, A. D.- 1866.

ALBERT MooRE. n s.]

Witnesses G. W. M. SMITH, Gus. A. MANTHY. 

